it’s not delineated at all and the Torah’s reference to it ensures that it can never be fulfilled.
Maybe that’s the point. That is where deiyezooger’s “pshetel” comes in. As long as we are in Galus, there will always be some mitziyus of Amalek that we will have to fulfill. Today we don’t know who they are to kill the people and animals. But we have their kefira to some extent that we need to destroy. When we strengthen our emunah maybe we are also being mekayem timcheh.